Technology Database  Engines THE "STIMUL" ADAPTIVE SYSTEM OF OPTIMAL IGNITION
The
“Stimul” Adaptive System Of Optimal Ignition
Not a single one of the
internal-combustion engines existing in Russia or elsewhere has an ignition
system - and this includes electronic and processor systems - with feedback to
evaluate its optimal mode at the moment of ignition.
The present systems are
open-circuited systems of direct regulation according to prescribed programs.
Unable to determine the optimal moments of ignition, they are capable only of
determining the ignition moments that were programmed for the principal
operating modes of the engine during its development. The many factors affecting
the combustion of the air-fuel mixture that existing systems fail to take into
account prevent them from identifying the optimal moments of ignition in an
engine working in real operating conditions and modes, and, hence, from
achieving the maximum engine output possible in those conditions.
 The introduction of feedback
directly from the combustion chamber enables the system, irrespective of
specific factors affecting operating conditions, to adapt in such a way as to
assure maximum engine output in the changed conditions by correcting the
ignition moments.
The “Stimul” device, based on
this principle, is designed to determine and utilize the optimal moments of
ignition in an internal-combustion engine. The device together with the engine
forms a closed system of automatic regulation, which ensures the maximum-output
performance of the engine in whatever operating conditions may arise. The
feedback parameter used is the pressure in the engine cylinders during the
burning of the air-fuel mixture, which is registered by a pressure-sensitive
pickup. The heart of the Stimul device is its microcomputer. If there is an
onboard computer in the car, it can assume the functions of the device and
implement its functional algorithm.
In its quality characteristics,
“Stimul” is superior to the Bosch, Siemens, Lucas, and other systems of this
type and can advance engine design a notable step forward.
The utilization of the new system
offers a number of advantages.
At the stage of engine design and
development, it:
-
Eliminates the need for work
to study the engine in order to determine the optimal moments of ignition as
a function of individual performance parameters.
-
Eliminates the need to
develop and manufacture special devices (such as, say, a centrifugal
governor and a vacuum regulator), which serve to determine the ignition
moments depending upon the values of individual parameters of engine
operation, or devices intended to prevent detonation.
At the stage of operation, it:
-
Increases actual engine
output.
-
Reduces fuel consumption.
-
Extends the service life of
the engine.
-
Reduces the toxicity of the
exhaust gases.
-
Makes the vehicle more
dynamic.
-
Makes it possible to use fuel
of differing quality
-
Makes it possible to monitor
the quality of the fuel on a dial included in the system.
The “Stimul” ignition system
is compatible with injection control systems and can serve as a basis for
developing a basically new, comprehensive system of engine control.
Source: SciTecLibrary.ru
Publishing date: October 19, 2000
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